Engine noises

[Charles P]

Tony Bett's pistons are great but come in metric over sizes, so would mean a rebore. Seven Workshop are imperial.
I'd be tempted to clean it up and regrind the valves, reassemble, check compressions and see how it runs. If it still has an uncomfortable noise you can loosen the tappets and remove the block, head and exhaust manifold off as one, so you don't disturb the new gaskets

Charles